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This is a picture I took of the NASA super high altitude pressure balloon about 8 years ago as it crossed over Canberra.
This balloon was carrying about a tonne of instrument payload at high extreme altitude.
When I first spotted it, I didn't know what it was and it looked weird. I first pulled up in my car so I could get a better look then drove home and took this picture with a 100mm f12.5 maksutov. It moved much slower than you have described.
Good luck identifying your mystery object.
Joe
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